Health pickups are items that can be collected in the various maps during gameplay. They restore a set amount of the user's health when picked up and automatically regenerate after ten seconds. There are three different types of health pickups (small, medium, and large) that can be found, with each restoring a different amount of hitpoints depending on the size of the pickup and the class you're currently playing. There are also Halloween variants of the health pickups, which can be seen below in the image gallery.

A player can be healed by several different methods, including healing by friendly Medics (and, as a disguisedSpy, enemy Medics as well). Since these pickups are a vital item in combat, be sure to use them wisely; consider letting a teammate who has less health than you grab it, or especially a nearby Medic who may need it. When healed by any source outside of a Medic's healing, a small green-colored cross is emitted in the lower-left HUD along with the number of hitpoints restored.

Sources

Health kits

Most maps have health kits available in various locations around the map, excluding most Arena maps. All health kits have a 10 second respawn time, and play a distinct sound that only the player can hear when used.

Small Health kit: Heals roughly a fifth (20.5%) of the user's health. It is also dropped by any player who is killed during Medieval Mode.